Oxygen evolution and corrosion behaviours of the porous Mn₅Si₃ electrode in sulfuric acid

Electrocatalytic Oxygen Evolution Reaction in Acidic Conditions: Recent Progress and Perspectives

“…In general, transition metals (e. g., Ni, Co, Fe) are adopted to alloy with Ir/Ru to form the alloyed catalysts for activity Reproduced with permission. [225] Copyright 2019, IOP science. (C) Stability test for γ-MnO 2 at pH 2.…”

“…Subsequently, the electrochemical test suggested that the porous Mn 5 Si 3 electrode shows good OER activity and stability in 1.0 m H 2 SO 4 medium (Figure 11B). [225] In addition, Han and co-workers also demonstrated that Mn-based oxide (γ-MnO 2 ) not only exhibited a high OER activity but also showed no signs of deactivation even after 8000 h of electrolysis at specific potential windows at pH 2 (Figure 11C). Such distinguished durability is greatly superior to existing acid-stable 3d-metal OER catalysts.…”

“…Accordingly, in recent, a large number of nonprecious materials have been demonstrated as an active and acidstable catalyst for OER. [225][226][227][228][229][230][231][232][233][234] For instance, Li et al developed an Mn-based porous Mn 5 Si 3 electrode for metal electrowinning by powder metallurgy (Figure 11A). Subsequently, the electrochemical test suggested that the porous Mn 5 Si 3 electrode shows good OER activity and stability in 1.0 m H 2 SO 4 medium (Figure 11B).…”

“…(B) LSV curves of Mn 5 Si 3 in 1.63 m sulfuric acid solutions. Reproduced with permission [225]. Copyright 2019, IOP science.…”

Perspectives on the development of highly active, stable, and cost‐effective OER electrocatalysts in acid

“…Although research on many other types of compounds such as transition metal sulfides, [196][197][198][199] phosphides, 200,201 nitrides, 202 carbides, 203 borides, 204 or even metal-free catalysts (usually carbon-based materials) [205][206][207][208][209][210][211][212][213][214][215][216][217] is actively underway, the development of low-cost, and highly efficient OER electrocatalysts that operate at high power (giga/terawatt-levels) close to the actual PEMWE operating conditions is necessary to overcome the biggest challenge in implementing largescale hydrogen production technology. However, very recently, Li et al proposed a spinel Co 2 MnO 4 catalyst that exhibited excellent ultrahigh current OER performances, which could contribute to great progress toward real large-scale hydrogen production, as it provides a feasible solution for the aforementioned problem (Figure 22).…”